inet6num: 2400:e480::/32 netname: FISC-NET descr: Financial Information Service Co., Ltd. descr: No.81, Sec. 3, Kangning Rd., Neihu Dist., descr: Taipei City Taiwan 114 admin-c: FH666-AP tech-c: FH666-AP country: TW mnt-by: MAINT-TW-TWNIC mnt-irt: IRT-TWNIC-AP status: ALLOCATED PORTABLE last-modified: 2014-04-15T06:39:32Z source: APNIC
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.